The reference 7700XT will support up to 4 displays natively on its integrated ports, and potentially more if using DP daisy-chaining or MST hubs.
Try a different cable or output type. Does your monitor support DP natively or are you using an adapter?
Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT